EP0979173A1 - Record material for pressure-sensitive copying systems - Google Patents
Record material for pressure-sensitive copying systemsInfo
- Publication number
- EP0979173A1 EP0979173A1 EP98919309A EP98919309A EP0979173A1 EP 0979173 A1 EP0979173 A1 EP 0979173A1 EP 98919309 A EP98919309 A EP 98919309A EP 98919309 A EP98919309 A EP 98919309A EP 0979173 A1 EP0979173 A1 EP 0979173A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- composition
- colouring agent
- record material
- pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
- B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
- B41M5/132—Chemical colour-forming components; Additives or binders therefor
Definitions
- This invention relates to record material for use in pressure-sensitive copying systems.
- Such record material is also known as carbonless copying paper.
- Pressure-sensitive copying systems are well-known and are widely used in the production of business forms sets.
- Various types of pressure- sensitive copying system are known, of which the most widely used is the transfer type.
- a business forms set using the transfer type of pressure- sensitive copying material comprises an upper sheet (usually known as a "CB" sheet) coated on its lower surface with microcapsules containing a solution in an oil solvent or solvent composition of at least one chromogenic material
- a colour former (alternatively termed a colour former) and a lower sheet (usually known as a "CF" sheet) coated on its upper surface with a colour developer composition.
- CFB intermediate sheets
- Imaging pressure exerted on the sheets by writing, typing or impact printing e.g. dot-matrix or daisy-wheel printing
- ruptures the microcapsules thereby releasing or transferring chromogenic material solution on to the colour developer composition and giving rise to a chemical reaction which develops the colour of the chromogenic material and so produces a copy image.
- the solution of chromogenic material may be present as isolated droplets in a continuous pressure-rupturable matrix instead of being contained within discrete pressure-rupturable microcapsules .
- microcapsules and colour developing co-reactant material are coated onto the same surface of a sheet, and writing or typing on a sheet placed above the thus-coated sheet causes the microcapsules to rupture and release the solution of chromogenic material, which then reacts with the colour developing material on the sheet to produce a coloured image .
- a security feature could be provided in a business forms set by the use of a conventional security paper as the base paper for subsequent coating with microcapsules and colour developer composition.
- a conventional security paper as the base paper for subsequent coating with microcapsules and colour developer composition.
- Such security paper an example of which is disclosed in our European Patent Application No. 391542A, can be authenticated by the use of an authenticating reagent which produces a colour change on application to the genuine security paper.
- such security papers are normally too expensive for use in business forms sets, except for specialities such as cheques.
- record material for use in pressure-sensitive copying systems, said record material comprising a paper substrate optionally surfaced-sized with a surface sizing composition and carrying:
- said coatings when both present, being on opposite surfaces of the substrate or on the same surface thereof, and when present on the same surface being either in separate layers or mixed in a single layer, characterised in that:
- the present invention provides a method of producing record material for use in pressure-sensitive copying systems, said record material comprising a paper substrate optionally surface-sized with a surface sizing composition and carrying:
- said coatings when both present, being on opposite surfaces of the substrate or on the same surface thereof, and when present on the same surface being either in separate layers or mixed in a single layer, characterised by the steps of:
- the present invention provides a business forms set comprising pressure-sensitive copying material as just defined.
- the present invention resides in the use, for the purpose of providing a security feature in record material for pressure-sensitive copying systems, of a colouring agent to accentuate the coating pattern of a sizing composition or other coating carried on one surface of the record material, thereby to make said one surface distinguishably different from the opposite surface of the record material .
- the further coating referred to above can be a coating present solely for colouration purposes or a coating having an additional technical function, for example, a precoat beneath the coating of isolated droplets of oil solution.
- the surface size when present, can be conventional in nature, for example it may be a starch or polyvinyl alcohol surface size.
- the pressure-rupturable barrier within which each droplet of chromogenic material solution is confined is typically the wall of a microcapsule .
- the pressure- rupturable barrier can be part of a continuous pressure- rupturable matrix as referred to earlier.
- the paper substrate may be white or coloured.
- the hue of the dye or other colouring agent used should differ from the hue of the base paper, and should be such as to be readily noticeable to the human eye.
- the colouring agent could take another form, for example it could be a particulate coloured pigment ("coloured" in this context includes white) .
- the colouring agent is a dye of a type having a strong affinity for cellulosic fibres as used in paper making, so that it will fix to the fibres and not be displaced by any subsequent processing.
- the colouring agent can be added to a surface sizing formulation, a microcapsule composition or a colour developer formulation.
- concentration of colouring agent used can be determined in accordance with the intensity of pattern desired. Adjustment of colouring agent concentration to vary the intensity of the pattern obtained can itself provide a supplementary security feature.
- the base paper has sizing composition and/or coatings applied to both of its surfaces, the composition (s) or coating (s) can both be coloured if desired, provided the resulting coloured coating patterns are distinguishably different. This will be the case if colouring agents of different hues are used, but the same colouring agent can be used for both surfaces, provided the intensity of colouration and/or the type of coating pattern on the two surfaces are distinguishably different.
- the colouring agent is a dye
- its degree of affinity for cellulosic paper making fibres is less significant when it is to be used in the microcapsule coating than when used in a starch surface sizing formulation, since there is less direct contact with the paper substrate.
- the use of fibre-fixing dyes can still be beneficial, even in a microcapsule coating.
- the surface sizing composition comprising the colouring agent is applied to the substrate by means of the roll element of a Billblade coater at the same time as a colour developer coating is applied to the opposite surface of the substrate by means of the blade element of the Billblade coater.
- the result is a CF paper having a distinctive film-split pattern in the surface size coating which pattern is highlighted and made more noticeable by the presence of the colouring agent.
- the distinctiveness of the resulting pattern enhances its value as a security feature. Since the result is achieved simply by addition of colouring agent to an otherwise conventional surface sizing composition, achievement of a security feature in this way is very cost- effective .
- a metered size press coater may be used instead of a
- Billblade coater for applying surface size to one surface of the substrate and a colour developer coating to the opposite surface to produce CF paper.
- a metered size press coater can also be used to produce CB paper if a microcapsule coating composition is applied to the opposite surface of the substrate, instead of a colour developer coating.
- Other possibilities offered by a metered size press coater include the application of a precoat as referred to above to one surface of the substrate and a surface sizing composition or colour developer composition to the other surface.
- the size composition can be coloured, with the CF, CB or precoat coating uncoloured, or vice versa.
- the surface size composition and the CF, CB or precoat coating can both be coloured, provided the colours are different or of distinguishably different intensities.
- a metered size press coater can of course also be used just for surface sizing, i.e. applying the same or different surface sizing compositions to the opposite surfaces of the base paper substrate, with one or both compositions being coloured (in the latter case, the colours must be different or of noticeably different intensities unless the coater can be operated to give distinguishably different types of coating pattern on the two surfaces) .
- Metered size press coaters are commercially available from Voith under the name “Speedsizer” ; from Valmet under the name “Sym-sizer”; from Jagenberg under the name “Filmpress” ; and from BTG under the name “Twin HSM” . Whilst they have been designed with a view to eliminating or minimising the occurrence of film-split or other coating patterns, they can be operated in such way as to produce a coating pattern sufficient for the purposes of the present invention.
- a CF product made as described above can readily be made into a CFB product by the subsequent application of a suitable microcapsule coating over the coloured surface size. Since microcapsule coatings are normally transparent or translucent, the coloured surface size will still be visible and effective as a security feature.
- a colouring agent of different hue to that of the base paper is added to a microcapsule coating composition prior to its application to the base paper by a roll-coating or other method which produces an uneven coating pattern.
- the effect of the colouring agent is to accentuate irregularities in the evenness with which the coating is distributed over the surface of the base paper and thus to produce a distinctive coloured pattern.
- the mode of operation of the coating equipment for example coating or smoothing roll speeds
- our experience is that this is not normally necessary, as the roll-coating and/or roll- smoothing processes conventionally used for coating microcapsules inevitably result in a "film-split pattern" which is sufficiently distinctive without further modification.
- the present pressure-sensitive copying material may be used not only for applications in which the material provides proof of entitlement to a payment as described earlier but also for other applications where security is important.
- One such application is tickets for sporting or theatre events or the like or for travel.
- Another such application is documents providing evidence of a right to enter a restricted area or territory, where entry is granted on presentation of documentary authority, for example to a gatekeeper or receptionist or to a border or immigration official .
- the chromogenic material present may include a fluorescent component as an additional security feature, as disclosed in our above- mentioned European Patent Application No. 0771669 A.
- the pressure-sensitive copying material can be conventional.
- the microcapsules may be produced by coacervation of gelatin and one or more other polymers, e.g. as described in U.S. Patents Nos. 2800457; 2800458; or 3041289; or by in situ polymerisation of polymer precursor material, e.g. as described in U.S. Patents Nos. 4001140; 4100103; 4105823 and 4396670, or by interfacial techniques such as disclosed in US Patents Nos. 4379071; 4428983; 4412959; 4253682; or 4181639.
- the chromogen-containing microcapsules once produced, are formulated into a coating composition with a suitable binder, for example starch or a starch/carboxymethylcellulose mixture, and a particulate agent (or "stilt material") for protecting the microcapsules against premature microcapsule rupture.
- a suitable binder for example starch or a starch/carboxymethylcellulose mixture
- a particulate agent or "stilt material”
- the resulting coating composition is then applied by conventional coating techniques, for example metering roll coating or air knife coating.
- the thickness and grammage of the base paper used in the present record material can be as conventional for this type of product, for example the thickness may be about 60 to 90 microns and the grammage about 35 to 50 g m ⁇ 2 , or higher, say up to about 100 g m "2 , or even more. This grammage depends to some extent on whether the final paper is for CB, CF, CFB or self-contained use. The higher grammages just quoted are normally applicable only to speciality CB papers.
- the base paper may be acid-sized (typically rosin-alum sized) or neutral- or alkaline sized, for example with alkyl ketene dimer or succinic anhydride sizes. If neutral- or alkaline- sizing is used, the paper is preferably treated with an agent for counteracting discolouration, as disclosed more fully in our European Patent Application No. 576176A or No. 491487A.
- the solvent used to dissolve the chromogenic materials can be chosen, for example, from partially hydrogenated terphenyls, alkyl naphthalenes, diarylmethane derivatives, dibenzyl benzene derivatives, alkyl benzenes and biphenyl derivatives, optionally mixed with diluents or extenders such as kerosene, or from vegetable oils, optionally mixed with esters.
- diluents or extenders such as kerosene
- vegetable oils optionally mixed with esters.
- vegetable oil-based systems are disclosed in our European Patent Applications Nos. 520639A, 573210A and 593192A.
- the colour developer material used may be an acid clay, e.g. as described in US Patent No. 3753761; a phenolic resin, e.g. as described in US Patent No. 3672935 or No. 4612254; or an organic acid or metal salt thereof, e.g. as described in US Patent No. 3024927, European Patent Application Nos. 275107A, 503443A or 521474A, or German Offenlegungsschrift No. 4110354A.
- the colour developer material is formulated into a coating composition with a suitable binder, for example a styrene-butadiene or other latex.
- the composition may of course be coloured to provide the security feature of the invention.
- Additional security features can be incorporated in the present record material if desired, for example by dyeing the stilt material prior to use or by the inclusion of microcapsules containing coloured dyes . Both of these expedients produce a coating containing coloured specks visible with a hand lens. A further possibility is the inclusion of fluorescent pigment granulates as disclosed in European Patent No. 226367B.
- a fibre-fixing disazo red dye (“Pergasol* Red 2B liquid” supplied by Ciba Speciality Chemicals as a wet dye concentrate) was added to two conventional aqueous starch surface sizing compositions each containing 3% by weight of acetylated corn starch ("Collofilm* 124" supplied by Amylum) .
- the concentration of red dye was 0.7% by weight in one batch and 1.4% by weight in the other calculated in both cases as weight of wet dye concentrate as supplied to total wet weight of surface sizing composition.
- the resulting dyed solutions were applied separately to one surface of a conventional yellow carbonless base paper by means of the roll element of a Billblade coater, the blade element of which simultaneously applied a yellow-hue conventional clay-based colour developer composition to the other surface of the paper.
- a distinctive and clearly discernable red pattern was obtained, with the yellow base paper showing through.
- the higher dye concentration composition gave a much more intense pattern, and it is probable that with this particular dye, 0.7% is close to the minimum effective dye concentration which could be used.
- the type of pattern obtained is shown in the accompanying Figure, which is a photocopy of the coloured pattern obtained, the darker areas representing red and the lighter areas yellow.
- Sheets of the resulting papers and of a yellow control CF paper for which the surface size had not been dyed red were then laboratory-coated on their starch-sized surface with a microcapsule composition as conventionally used in carbonless copying paper at a dry coatweight of ca . 5 - 5.5 g rrf 2 .
- This composition contained, on a dry basis, 66% of microcapsules, 24.3% of particulate wheatstarch stilt material and 9.7% of a cooked starch binder.
- the microcapsules contained a red-developing chromogenic material ("Pergascript* Red I-6B" supplied by Ciba-Geigy) and a fluorescent yellow-developing chromogenic material ("Pergascript* Yellow I-3R") in 4:1 weight ratio in a 2:1 weight ratio mixture of a di-isopropylnaphthalene blend and kerosene.
- the microcapsules had been produced by a conventional gelatin coacervation microencapsulation process as generally described in British Patent No. 870476, using carboxymethyl cellulose and vinyl methyl ether/maleic anhydride copolymer as anionic colloids.
- microcapsule coating did not obscure or change the appearance of the underlying coloured pattern.
- the microcapsule coated surface was illuminated with UV light from a hand-held UV lamp, it was observed that the presence of the underlying coloured pattern did not interfere with the fluorescence produced by the fluorescent chromogenic material, i.e. it was the same as that obtained with the control paper.
- Example 2 This illustrates the use of dyed but otherwise conventional microcapsule compositions to produce patterned CB and CFB products.
- the dye used was as in Example 1, and was present in the microcapsule compositions at a level of 0.3% based on wet dye concentrate as supplied to total dry weight of coating composition.
- the dyed compositions were applied to white base paper and to the uncoated surface of yellow CF paper by means of an intermediate-scale pilot roll coater equipped with aftersmoothing rolls.
- the web speed of the paper during microcapsule coating was either 400 m min "1 or 700 m min ⁇ 1 , and the smoothing rolls were run at various different speeds so as to achieve a range of coating patterns .
- A. "Astrazon* Blue FBL” (an azacyanine liquid dyestuff preparation supplied by Bayer and containing 30 - 40% C.I. Basic Blue 159) used at addition levels of 0.25%, 0.5% and 1.0%.
- aqueous coating composition for use as a precoat beneath a microcapsule coating in pressure-sensitive record material was made up at 46.2% solids content from the following:
- Cyclic amide-aldehyde condensate 1 part (dry) cross-linking agent (“Sunrez 700M*, product of Sequa Chemicals Inc. USA)
- Example 6 Pilot-scale for applying a conventional clay-based colour developer composition to one surface of a white base paper and an inert kaolin pigment precoat composition to the other surface (the precoated surface was intended subsequently to be coated with a microcapsule composition) .
- the precoat was coloured blue by the addition of blue dye at a level of ca . 0.125 Kg dye per 100 Kg coating composition on a dry basis.
- the resulting coated paper was white on one surface (the CF surface) and generally blue on the other surface, the blue surface having a noticeable mottled coating pattern with the white base paper showing through.
- Example 6 Example 6
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9708582 | 1997-04-29 | ||
GBGB9708582.3A GB9708582D0 (en) | 1997-04-29 | 1997-04-29 | Record material for use in pressure-sensitive copying systems |
PCT/GB1998/001216 WO1998049014A1 (en) | 1997-04-29 | 1998-04-24 | Record material for pressure-sensitive copying systems |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0979173A1 true EP0979173A1 (en) | 2000-02-16 |
EP0979173B1 EP0979173B1 (en) | 2002-03-06 |
Family
ID=10811474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98919309A Expired - Lifetime EP0979173B1 (en) | 1997-04-29 | 1998-04-24 | Record material for pressure-sensitive copying systems |
Country Status (7)
Country | Link |
---|---|
US (1) | US6509295B1 (en) |
EP (1) | EP0979173B1 (en) |
AU (1) | AU7218998A (en) |
DE (1) | DE69804090T2 (en) |
ES (1) | ES2173575T3 (en) |
GB (1) | GB9708582D0 (en) |
WO (1) | WO1998049014A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7909892B2 (en) * | 2002-01-28 | 2011-03-22 | Basf Se | Aqueous dye solutions |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB967390A (en) | 1961-11-29 | 1964-08-19 | Caribonum Ltd | Improvements in or relating to pressure-sensitive recording material |
DE2233681A1 (en) | 1972-07-08 | 1974-01-24 | Molineus & Co | Carbon paper - coated with compsn contg indicator or coloured material of low resistance to chemicals |
FR2648395B1 (en) | 1989-06-19 | 1992-02-21 | Arjomari Prioux | PRESSURE SENSITIVE RECORDING MATERIAL HAVING GOOD PRINTABILITY AND CAPABLE OF SELF-SEPARATING BUNDLES, AS WELL AS A PRESSURE SENSITIVE SELF-COPYING SHEET AND SELF-COPING SHEET SHEET |
JPH03138189A (en) * | 1989-10-24 | 1991-06-12 | Fuji Photo Film Co Ltd | Image receiving material |
-
1997
- 1997-04-29 GB GBGB9708582.3A patent/GB9708582D0/en active Pending
-
1998
- 1998-04-24 DE DE69804090T patent/DE69804090T2/en not_active Expired - Fee Related
- 1998-04-24 AU AU72189/98A patent/AU7218998A/en not_active Abandoned
- 1998-04-24 ES ES98919309T patent/ES2173575T3/en not_active Expired - Lifetime
- 1998-04-24 WO PCT/GB1998/001216 patent/WO1998049014A1/en active IP Right Grant
- 1998-04-24 US US09/403,983 patent/US6509295B1/en not_active Expired - Fee Related
- 1998-04-24 EP EP98919309A patent/EP0979173B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9849014A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU7218998A (en) | 1998-11-24 |
ES2173575T3 (en) | 2002-10-16 |
DE69804090D1 (en) | 2002-04-11 |
US6509295B1 (en) | 2003-01-21 |
WO1998049014A1 (en) | 1998-11-05 |
DE69804090T2 (en) | 2002-08-22 |
EP0979173B1 (en) | 2002-03-06 |
GB9708582D0 (en) | 1997-06-18 |
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